Display apparatus for displaying video input through various ports

ABSTRACT

A display apparatus displaying video input through various ports is provided. The display apparatus includes a board which is disposed behind a display module, wherein the board includes a universal serial bus (USB) port which receives a USB standard signal, a decoder which decodes a video signal from the USB standard signal and outputs a decoded signal, a video output unit which outputs a displayable video signal to the display module corresponding to the video signal, wherein the USB port is disposed at an edge of a first side of the board, and the video output unit is disposed at an edge of a second side which is different from the first side of the board. The video output unit receives video from an external apparatus such as a computer through a USB port in addition to a DVI port and D-SUB port, and displays the received video. Display apparatuses having additional ports than the DVI ports and D-SUB ports may be connected to a computer without requiring additional hardware.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority under 35 U.S.C. § 119 from KoreanPatent Application No. 10-2007-0030940, filed on Mar. 29, 2007, in theKorean Intellectual Property Office, the disclosure of which isincorporated herein by reference in its entirety.

BACKGROUND OF THE INVENTION

1. Field of the Invention

Apparatuses consistent with the present invention relate to a displayapparatus, and more particularly, to a display apparatus which providesa user with video according to video data input from an externalapparatus.

2. Description of the Related Art

A representative example of display apparatus is a computer displayapparatus which displays video transmitted from a computer on a screen.

A display apparatus comprises ports such as a digital visual interface(DVI) port, or a D-subminiature (D-SUB) port to receive video from acomputer. Accordingly, a DVI port or D-SUB port is required in acomputer to transmit video from the computer to a display apparatus.

The number of DVI ports and D-SUB ports supported by a computer islimited, and therefore, the number of display apparatuses connectable toa computer are also limited. As a result, a problem occurs in that extrahardware (e.g. video cards) having a DVI port or a D-SUB port has to beadded.

Additionally, because DVI cables and D-SUB cables, connected to a DVIport or a D-SUB port, respectively, comprise a plurality of lines, thecost is increased.

SUMMARY OF THE INVENTION

Exemplary embodiments of the present invention overcome the abovedisadvantages and other disadvantages not described above. Also, thepresent invention is not required to overcome the disadvantagesdescribed above, and an exemplary embodiment of the present inventionmay not overcome any of the problems described above.

The present invention provides a display apparatus displaying a videoinput through various ports, and a method to connect a plurality ofdisplay apparatuses without requiring additional hardware.

According to an aspect of the present invention, there is provided adisplay apparatus comprising: a board which is disposed behind a displaymodule, wherein the board comprises, a universal serial bus (USB) portwhich receives a USB standard signal, a decoder which decodes a videosignal from the USB standard signal and outputs a decoded signal, avideo output unit which outputs a displayable video signal to thedisplay module, corresponding to the video signal, wherein the USB portis disposed at an edge of a first side of the board, and the videooutput unit is disposed at an edge of a second side which is differentfrom the first side of the board.

The first side and the second side may be opposite to each other.

The display apparatus may comprise a signal converting unit whichconverts the decoded video signal; and a signal processing unit whichconverts the converted video signal into the displayable video signal,wherein the decoder, the signal converting unit, and the signalprocessing unit are adjacently disposed on the board.

The converted video signal may be Transition Minimized DifferentialSignaling (TMDS) format signal, and the displayable video signal may bea low voltage differential signaling (LVDS) format signal.

A distance between the USB port and the signal converting unit may beshorter than a distance between the USB port and the signal processingunit.

A distance between the USB port and the decoder may be shorter than adistance between the USB port and the signal processing unit

The display apparatus may further comprise a power supply circuit boardcomprising a plurality of power supply circuit elements, wherein thepower supply circuit board is spaced apart from the board, and isdisposed behind of the display module.

A power output port mounted in the power supply circuit board may beconnected with a power input port mounted in the board through a powersupply cable.

According to another aspect of the present invention, there is provideda display apparatus comprising a board which is disposed behind adisplay module, wherein the board comprises: a port which receives afirst video signal; a universal serial bus (USB) port which receives aUSB standard signal; a decoder which decodes a second video signal fromthe USB standard signal and outputs a decoded second video signal; avideo output unit which outputs a displayable video signal to thedisplay module, corresponding to either the first video signal or thesecond video signal, wherein the USB port is disposed at an edge of afirst side of the board, and the video output unit is disposed at anedge of a second side which is different from the first side of theboard.

The USB port and the port may be adjacently disposed, and the first sideand the second side may be opposite to each other.

The port may be a digital visual interface (DVI) port.

The display apparatus may comprise a signal converting unit whichconverts the second video signal into a third video signal; and a signalprocessing unit which converts at least one of the first video signaland the third video signal into a displayable video signal, wherein thedecoder, the signal converting unit, and the signal processing unit areadjacently disposed on the board.

The third video signal may be Transition Minimized DifferentialSignaling (TMDS) format signal, and the displayable video signal is alow voltage differential signaling (LVDS) format signal.

A distance between the USB port and the decoder may be shorter than adistance between the USB port and the signal processing unit.

A distance between the USB port and the signal converting unit isshorter than a distance between the USB port and the signal processingunit.

The display apparatus may comprise a switching unit which outputs one ofthe first video signal transmitted from the port and the third videosignal transmitted from the signal converting unit to the signalprocessing unit, wherein the switching unit is mounted on the board, anddisposed between the USB port and the signal processing unit.

A distance between the USB port and the switching unit is shorter than adistance between the USB port and the signal processing unit.

A distance between a center of the display apparatus and the USB portmay be shorter than a distance between the center of the displayapparatus and the port.

The port may be a D-subminiature connectors (D-SUB) port.

The display apparatus may comprise a signal converting unit whichconverts the second video signal into a third video signal; and a signalprocessing unit which converts at least one of the first video signaland the third video signal into a displayable video signal, wherein thedecoder, the signal converting unit, and the signal processing unit areadjacently disposed on the board.

The first video signal is a red, green, and blue (RGB) format signal,and the third video signal is a LVDS format signal.

A distance between the USB port and the decoder may be shorter than thedistance between the USB port and the signal processing unit.

A distance between the USB port and the signal converting unit may beshorter than the distance between the USB port and the signal processingunit.

According to also another aspect of the present invention, there isprovided a display apparatus having a display module, the displayapparatus comprising a first printed circuit board which is disposedbehind of the display module, and comprises a plurality of power supplycircuit elements; a second printed circuit board which is adjacentlydisposed to the first printed circuit board; wherein the second printedcircuit board comprises: a USB port which receives a USB standard signalfrom an external apparatus; a first circuit module which transmits andreceives the USB standard signal to and from a second externalapparatus; a second circuit module which converts a video signal fromthe USB standard signal into a predetermined format; and a third circuitmodule which converts the video signal transmitted from the firstcircuit module or a third external apparatus into a displayable videosignal, and transmits the displayable video signal to the displaymodule, wherein the USB port and the second circuit module areadjacently disposed on the second printed circuit board.

The second circuit module may comprise a decoder which decodes a videosignal from the USB standard signal output from the USB port; and asignal converting unit which converts the decoded video signal outputfrom the decoder, wherein the decoder, the signal converting unit, andthe USB port are sequentially arranged from top to bottom of the secondprinted circuit board.

The third circuit module may comprise a switching unit which outputs oneof the video signal output from a DVI port and the video signal outputfrom the second circuit module; and a signal processing unit whichconverts the video signal output from the switching unit into adisplayable video signal, wherein the switching unit is disposed in anarea defined by the DVI port, the USB port and the signal processingunit.

The first circuit module may be mounted on a different surface from asurface of the second printed circuit board mounting the third circuitmodule.

The first circuit module may comprise a USB hub which transmits the USBstandard signal output from the USB port to the second circuit module,or transmits the USB standard signal to the second external apparatusthrough the USB port and other ports.

The second circuit module may be mounted on the face of the secondprinted circuit board, and the USB hub is mounted on the rear side ofthe second printed circuit board.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other aspects of the present invention will becomeapparent and more readily appreciated from the following description ofexemplary embodiments, taken in conjunction with the accompanyingdrawings of which:

FIG. 1 is a block diagram illustrating a connection relationship of adisplay apparatus and an external apparatus according to an exemplaryembodiment of the present invention;

FIG. 2 is an exploded perspective view of a display apparatus accordingto an exemplary embodiment of the present invention;

FIG. 3 is a block diagram illustrating a circuit module and input/outputports mounted in a second printed circuit board according to anexemplary embodiment of the present invention;

FIGS. 4A and 4B are views illustrating a layout of a first circuitmodule, a second circuit module, a third circuit module, andinput/output ports mounted on a second printed circuit board of adisplay apparatus according to an exemplary embodiment of the presentinvention; and

FIG. 5 is a view wherein a first printed circuit board and a secondprinted circuit board of a display apparatus are engaged on a boardsupporting frame, according to an exemplary embodiment of the presentinvention.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS OF THE INVENTION

Certain exemplary embodiments of the present invention will now bedescribed in greater detail with reference to the accompanying drawings.

FIG. 1 is a block diagram illustrating a connection relationship of adisplay apparatus and an external apparatus according to an exemplaryembodiment of the present invention. A first display apparatus 120 mayreceive video from an external apparatus such as a computer 110 throughvarious ports, display the received video, and transmit the video to asecond display apparatus 130. The first display apparatus 120 maytransmit various signals such as a video signal, or a text signal,received from the computer 110 to the second display apparatus 130.

FIG. 2 is an exploded perspective view of a display apparatus, such asthe first display apparatus of FIG. 1, according to an exemplaryembodiment of the present invention. The first display apparatus maycomprise a front cover 210, a display module 230, a board supportingframe 240, a first printed circuit board 400, a second printed circuitboard 300, a screen cover 250, and a rear cover 200.

A display window is formed on a plate surface of the front cover 210such that a video signal displayed on the display module 230 is exposedoutside. The exterior of the display apparatus 120 is formed bycombining the front cover 210 and the rear cover 220 to house thedisplay module 230, the board supporting frame 240, and the screen cover250 therein.

The display module 230 may be a flat display module such as a liquidcrystal display (LCD) module, a plasma display panel (PDP) module, or anorganic electro-luminescence (OEL) module.

The board supporting frame 240 according to an exemplary embodiment ofthe present invention may be engaged to the front cover 210, and at adistance apart from the rear surface of the display module 230.

The first printed circuit board 400 and the second printed circuit board300 are disposed near the rear surface of the board supporting frame240. When the second printed circuit board 300 is engaged to the boardsupporting frame 240, space is ensured between the second printedcircuit board 300 and the board supporting frame 240 for the positioningof a circuit element.

When viewed from the back, the first printed circuit board 400 isdisposed at the left-rear side of the board supporting frame 240 and thesecond printed circuit board 400 is disposed at the right-rear side ofthe board supporting frame 240, in the display apparatus 120 accordingto an exemplary embodiment of the present invention.

A plurality of power supply circuit elements and an output port 350 maybe disposed on the first printed circuit board 400. The plurality ofpower supply circuit elements supply power to drive the displayapparatus 120, and the output port 350 provides power supplied from thepower supply circuit elements to the second printed circuit board 300.The output port 350 is connected through a power supply cable to aninput port 311.

The second printed circuit board 300 is engaged at the rear surface ofthe board supporting frame 240, adjacent to the first printed circuitboard 400. The second circuit board 300 comprises the first circuitmodule 320 to transmit and receive a universal serial bus (USB) standardsignal to and from an external apparatus such as the computer 110 or thesecond display apparatus 130, the second circuit module 330 to convert acompressed video signal into a predefined format, the third circuitmodule 340 to convert at least one among the converted video signaltransmitted from the second circuit module 330 and the video signaltransmitted from the computer 110 into a displayable video signal, andto transmit the displayable video signal to the display module 230, andthe output ports 350.

The first and second printing circuit boards 400 and 300 mayalternatively be disposed on a mounting support at the rear side of thefront cover 210 or the display module 230, instead of using the boardsupporting frame 240. Additionally, the screen cover 250 may beintegrated with the rear cover 220.

FIG. 3 is a block diagram illustrating circuit modules 320, 330, and340, and the input/output ports 310 and 350 mounted in the secondprinted circuit board 300 according to an exemplary embodiment of thepresent invention. The second printed circuit board 300 may comprise thefirst circuit module 320, the second circuit module 330, the thirdcircuit module 340, the input port 310, and the output port 350.

Ports related to the present invention are divided into the input port310 inputting a signal to the display apparatus 120 and the output port350 transmitting a signal to the exterior apparatus. The input ports 310may be at least one among a D-SUB port 312, a digital visual interface(DVI) port 314, a first USB port 316, a second USB port 318, and a powerinput port (not shown), and the output ports 350 may be at least oneamong a video output port 352, and a third USB port 354.

The D-SUB port 312 is connected with the computer 110 through a D-SUBcable (not shown), and receives an analogue video signal of D-SUBstandard from the computer 110. The D-SUB port 312 comprises many pins,in which i) some of the pins are used to transmit a synchronizationsignal from the computer 110 to the display apparatus 120, ii) some ofthe pins are used to transmit a video signal from the computer 110 tothe display apparatus 120, and iii) the rest of the pins are used forother uses. The analogue video signal of D-SUB standard may be a redgreen blue (RGB) standard signal.

The DVI port 314 is connected with the computer 110 through a DVI cable,and receives a digital video signal of DVI standard from the computer110. The DVI port 314 comprises many pins, in which i) some of the pinsare used to transmit clock signals from the computer 110 to the displayapparatus 120, ii) some of the pins are used to transmit a video signaland synchronization information from the computer 110 to the displayapparatus 120, and iii) the rest of the pins are used for other uses.The digital video signal of a DVI standard may be a Transition MinimizedDifferential Signaling (TMDS) standard signal.

The first USB port 316 is connected with the computer 110 through a USBcable, and receives a USB standard signal from the computer 110. Thefirst USB port 316 has a difference from the DVI port 314 which is usedto receive a video signal from the computer 110, in that the first USBport 316 can receive other signals in addition to the video signal fromthe computer 110. For example, the first USB port 316 may be used toreceive not only a video signal, but also an audio signal, a textsignal, a control signal, or others from the computer 110. Although theUSB port is capable of two-way communications, the first USB port 316 isclassified into an input port in that the USB standard signaltransmitted from the computer 120 is transmitted to the displayapparatus 120.

The second USB port 318 is connected with an apparatus receiving a usercommand such as a keyboard, and transmits a signal including the usercommand to the USB hub 322. The second USB port 318 has a differencefrom the first USB port 316, in that the second USB port 318 receivessignals besides a video signal. The second USB port 318 is classifiedinto the input port, in that the second USB port 318 transmits a signalincluding a user command to the computer 110 through the displayapparatus 120.

The video output port 352 outputs a displayable video signal outputthrough a signal processing unit 344 which will be explained below, to adisplay module 230. The video output port 352 and the display module 230are connected with each other using a low voltage differential signaling(LVDS) cable.

The third USB port 354 is connected with the second display apparatus130 through a USB cable. The third USB port 354 is classified into theoutput port 350 because the third USB port 354 transmits a USB standardsignal output from the USB hub 322 to the second display apparatus 130.The third USB port 354 also can transmit the USB standard signal to thedisplay apparatus 120 as the first and second USB ports 316 and 318, butit will be omitted for convenient description.

The first circuit module 320 transmits and receives a USB standardsignal or a display driving program to an external apparatus, and maycomprise the USB hub 322, a memory control unit 324, and a first memory326.

The USB hub 322 transmits a USB standard signal input from the first USBport 316 to a decoder 322 or the third USB port 354. Whether the USB hub322 transmits the USB standard signal to the decoder 322 or to the thirdUSB port 354 is determined on the basis of information in a packet ofthe USB standard signal. The USB hub 322 may be a distributor whichtransmits the USB standard signal input from the first USB port 316 tothe decoder 332, the memory control unit 324, and the third USB port354, respectively.

If the memory control unit 324 retrieves the display driving programstored in the first memory 326, and transmits the retrieved displaydriving program to the USB hub 322, the USB hub 322 outputs thetransmitted display driving program to the computer 110 through thefirst USB port 316. Accordingly, the computer 110 may set up the displaydriving program.

The second circuit module 330 converts a video signal among compressedvideo signals into a predefined format, and may comprise the decoder332, a second memory 334, and a signal converting unit 336.

The decoder 332 decodes a video signal among the USB standard signaltransmitted from the USB hub 322, and transmits the decoded video signalto the signal converting unit 336. The decoded video signal may be atransistor-transistor logic (TTL) standard signal. The second memory 334provides storage space when the decoder 332 decodes a video signal amongthe USB standard signal. For example, the second memory 334 maytemporarily store the USB standard signal transmitted from the USB hub322, and transmits the stored USB standard signal to the decoder 332, ormay temporarily store the video signal decoded at the decoder 332, andtransmit the stored signal to the signal converting unit 336.

The signal converting unit 336 converts the TTL standard signal of thedecoded USB video signal into a TMDS standard signal, and transmits theconverted signal to a switching unit 342.

The third circuit module 340 processes an inputted video signal into adisplayable video signal, and may comprise the switching unit 342, andthe signal processing unit 344.

The switching unit 342 switches one of a video signal transmitted fromthe DVI port 314 and a video signal transmitted from the signalconverting unit 336, and outputs the switched signal to the signalprocessing unit 344. Since the video signal transmitted from the DVIport 314 and the signal converting unit 336 is a TMDS standard, theswitching unit 342 transmits one of the video signals to the signalprocessing unit 344. Accordingly, error of the signal processing unit344 is prevented.

The switching unit 342 performs a switch operation according to a‘connector priority’. The ‘connector priority’ determines which of avideo signal transmitted from the DVI port 314 and a video signaltransmitted from the USB port is displayed. That is, if the USB port hasthe higher priority than the DVI port 314, and if a video is input toboth the DVI port 314 and the USB port, the video input to the USB portis displayed first.

A user may select either a video signal input to the DVI port 314 or avideo signal input to the USB port using a select key (not shown) amongmanipulation devices on the display apparatus 120. The switching unit342 performs switch operation to display the video signal according to auser selection.

The signal processing unit 344 scales a video signal output from theswitching unit 342 or a video signal output from the D-SUB port 312, andperforms signal processing to convert the video signal into adisplayable video signal. The signal processing unit 344 processes eachvideo signal in a different manner to convert the video signals into anLVDS standard signal of a displayable video signal, depending on thevideo signal output from the switching unit 342 which is a digitalsignal, and the video signal output from the D-SUB port 312 which is ananalogue signal. The signal processing unit 344 transmits one of thevideo signals to a video output port.

Even when the signal processing unit 344 receives video signals from theswitching unit 342 and the D-SUB port at the same time, the signalprocessing unit 344 transmits only one of the video signals to the videooutput unit at a given time. Accordingly, the signal processing unit 344outputs a video according to the priority as in the switching unit 342.The priority may be arranged by a user selection or a manufacturer ofthe display apparatus 120.

FIGS. 4A and 4B are views illustrating a layout of the first circuitmodule 320, the second circuit module 330, the third circuit module 340,and the input/output ports, which are mounted on the second printedcircuit board 300. FIG. 4A is a view illustrating a layout of the firstcircuit module 320, the second circuit module 330, the third circuitmodule 340, and the input/output ports, which are mounted on the face ofthe second printed circuit board 300, and FIG. 4B is a view illustratinglayout of the USB hub 322 among the first circuit module 320 mounted onthe back of the second printed circuit board 300.

A surface of the second circuit board 300 opposite to the boardsupporting frame 240 is referred to as a back, and a reverse surface ofthe second circuit board 300 is referred to as a face for convenientdescription. If the second printed circuit board 300 is mounted to thedisplay apparatus 120, it is supposed that a side of the second printedcircuit board 300 contacting the bottom of the display apparatus 120 isa first side, a side of the second printed circuit board 300 contactingthe top of the display apparatus 120 is a second side, a side of thesecond printed circuit board 300 nearest to the first printed circuitboard 400 is a third side, and a side opposite to the third side is afourth side.

Also in the following description, an ‘interval’ between the circuitelements refers to a minimum distance from a predefined point of acircuit element to a predefined point of another circuit element. Forexample, there may be several distances a, b, c measured from severalpoints of the signal processing unit 344 to several points of theswitching unit 342 as illustrated in FIG. 4A. However, the minimumdistance from the signal processing unit 344 to the switching unit 342is distance ‘a’, according to an exemplary embodiment of the presentinvention. When the circuit elements are ‘adjacently disposed’, thismeans that there is no element between the circuit elements. Therefore,if there is no circuit element mounted on the interval between thecircuit elements, it is referred that the elements are adjacentlymounted.

Referring to FIG. 4A, input/output ports are disposed at the edge of thefour sides of the second printed circuit board 300. The input port 311to receive power from the first printed circuit board 400 is disposed inthe edge area of the second side and adjacent to the first printedcircuit board 400. Accordingly, the input port 311 is convenientlyconnected with the output port 350 mounted on the first printed circuitboard 400 through a power cable. The input port 311 may also be mountedat the edge of the third side.

The first USB port 316, DVI port 314, and the D-SUB port 312 may bearranged in a sequence. Although the arrangement of the first USB port316, DVI port 314, and the D-SUB port 312 may be changed, it isdesirable that the input ports are adjacently disposed at the edge ofthe first side in a row. Additionally, it is desirable that the firstUSB port 316 and the DVI port 314 are always arranged adjacent to eachother.

The second circuit module 330 is disposed in the edge area of the thirdside of the second circuit board 300. That is, the decoder 332, thesecond memory 334, and the signal converting unit 336 included in thesecond circuit module 330 are adjacently disposed at the edge of thethird side of the second circuit board 300 and above the first USB port316, so as to be closest to the first printed circuit board 400. Thedecoder 332, the second memory 334, and the signal converting unit 336may be disposed from the bottom in a sequential order. Since the area ofthe decoder 332 on the second printed circuit board 300 is larger thanthat of the signal converting unit 336, the decoder 332 may be disposedabove the signal converting unit 336, and since the second memory 334provides storage space for operation of the decoder 332, the secondmemory 334 my be disposed near of the decoder 332.

The decoder 332 which decodes a USB standard signal input from the firstUSB port 316, and the signal converting unit 336 are disposed adjacentto the first USB port 316 such that efficiency of signal processing maybe improved.

The third circuit module 340 which converts a video signal into adisplayable video signal may be disposed to the left of the firstcircuit module 320 and above the DVI port 314. The switching unit 342 ofthe third circuit module 340 may be disposed to the right of the signalconverting unit 336 and above the DVI port 314.

Since the switching unit 342 switches either a video signal output fromthe signal converting unit 336 or a video signal output from the DVIport 314, and transmits the switched signal to the signal processingunit 334, the switching unit 342 may be adjacent to the signalconverting unit 336 and the DVI port 314 respectively. The switchingunit 342 may be disposed between the first USB port 316 and the signalprocessing unit 344. More particularly, when the switching unit 342 maybe disposed in a triangular area or the circular area defined by thefirst USB port 316, the DVI port 314, and the signal processing unit344.

The signal processing unit 344 may be disposed above the switching unit342 and left of the decoder 332, and the video output unit may bedisposed above the signal processing unit 344 and near the edge of thefourth side. The video output unit transmits a video output from thesignal processing unit 344 to the display module 230 such that the videooutput unit may be adjacent to the signal processing unit 344. Also, thedecoder 332, the signal converting unit 336, and the signal processingunit 344 may instead be mounted in the first printed circuit board 400.

Referring to FIGS. 4A and 4B, the first circuit module 320 is mounted atthe face and back of the second printed circuit board 300 such that aspace of the second printed circuit board 300 may be used efficiently.For example, the memory control unit 324 and the first memory 326 arevertically arranged to the right of the signal processing unit 344 onthe face of the second printed circuit board 300, and the USB hub 322 ismounted on the back of the second printed circuit board 300corresponding to the mounting area of the memory control unit 324. Alongwith the USB hub 322, the memory control unit 324, the first memory 326,the second USB port 318, and the third USB port 354 may also be mountedon the back side of the second printed circuit board 300.

The second USB port 318, and the third USB port 354 are adjacentlymounted at the edge of the fourth side.

A distance between circuit elements mounted on the second printedcircuit board 300 will be explained in detail.

A USB standard signal output from the first USB port 316 is sequentiallyconverted through the decoder 332 and the signal converting unit 336,the converted signal is converted into a displayable video signal in thesignal processing unit 344. Accordingly, the decoder 332, the signalconverting unit 336, and the signal processing unit 344 may beadjacently arranged.

A distance (d) between the first USB port 316 and the signal convertingunit 336 may be shorter than a distance (e) between the first USB port316 and the signal processing unit 344, and a distance (f between thefirst USB port 316 and the decoder 332 may be shorter than the distance(e) between the first USB port 316 and the signal processing unit 344.

FIG. 5 is a view wherein the first printed circuit board 400 and thesecond circuit board 300 of a display apparatus are engaged on a boardsupporting frame 240. The first printed circuit board 400 and the secondprinted circuit board 300 are adjacently mounted on the board supportingframe 240. The output port 350 of the first printed circuit board 400 isconnected with the power input port 311 of the second printed circuitboard 300 through a power supply cable, and the video output unit of thesecond printed circuit board 300 is connected with the display module230 through a video supply cable. Elements illustrated in FIG. 5 aredescribed in FIGS. 2 to 4, and thus a description thereof will beomitted.

It is explained that in exemplary embodiments of the present inventionthat the first USB port 316 receives a video signal input, the secondUSB port 318 outputs the video signal, and the third USB port 354 inputsand outputs signals, other than video signals, but the functions are notlimited thereto. A USB port may perform bi-directional serialcommunication such that each USB port may perform as an input/outputport.

A display apparatus according to exemplary embodiments of the presentinvention may receive a video from an external apparatus such as acomputer through a USB port in addition to a DVI port and D-SUB port,and display the received video. Display apparatuses having additionalports to the DVI ports and D-SUB ports may be connected to a computerwithout requiring additional hardware. Additionally, a computer and adisplay apparatus may be connected using a USB cable which is cheaper asit requires less lines than the DVI cable or the D-SUB cable.Furthermore, because associated circuit elements, among the circuitelements mounted on a board are adjacently arranged, noise is reduced.

The foregoing exemplary embodiments and advantages are merely exemplaryand are not to be construed as limiting the present invention. Thepresent teaching can be readily applied to other types of apparatuses.Also, the description of the exemplary embodiments of the presentinvention is intended to be illustrative, and not to limit the scope ofthe claims, and many alternatives, modifications, and variations will beapparent to those skilled in the art.

1. A display apparatus comprising: a board which is disposed behind a display module, wherein the board comprises: a universal serial bus (USB) port which receives a USB standard signal, a decoder which decodes a video signal from the USB standard signal and outputs a decoded signal, a video output unit which outputs to the display module, a displayable video signal corresponding to the video signal, wherein the USB port is disposed at an edge of a first side of the board, and the video output unit is disposed at an edge of a second side of the board which is different from the first side of the board.
 2. The display apparatus of claim 1, wherein the first side and the second side are opposite to each other.
 3. The display apparatus of claim 1, comprising: a signal converting unit which converts the decoded video signal; and a signal processing unit which converts the converted video signal into the displayable video signal, wherein the decoder, the signal converting unit, and the signal processing unit are adjacently disposed on the board.
 4. The display apparatus of claim 3, wherein the converted video signal is a Transition Minimized Differential Signaling (TMDS) format signal,
 5. The display apparatus of claim 3, wherein the displayable video signal is a low voltage differential signaling (LVDS) format signal.
 6. The display apparatus of claim 3, wherein a distance between the USB port and the signal converting unit is shorter than a distance between the USB port and the signal processing unit.
 7. The display apparatus of claim 1, wherein a distance between the USB port and the decoder is shorter than the distance between the USB port and the signal processing unit.
 8. The display apparatus of claim 1, further comprising: a power supply circuit board comprising a plurality of power supply circuit elements, wherein the power supply circuit board is spaced apart from the board, and is disposed behind the display module.
 9. The display apparatus of claim 8, wherein a power output port mounted in the power supply circuit board is connected with a power input port mounted in the board through a power supply cable.
 10. A display apparatus comprising: a board which is disposed behind a display module, wherein the board comprises: a port which receives a first video signal; a universal serial bus (USB) port which receives a USB standard signal; a decoder which decodes a second video signal from the USB standard signal and outputs a decoded second video signal; a video output unit which outputs to the display module, a displayable video signal corresponding to either the first video signal or the second video signal, wherein the USB port is disposed at an edge of a first side of the board, and the video output unit is disposed at an edge of a second side of the board which is different from the first side of the board.
 11. The display apparatus of claim 10, wherein the USB port and the port are adjacently disposed, and the first side and the second side are opposite to each other.
 12. The display apparatus of claim 10, wherein the port is a least one of a digital visual interface (DVI) port and a D-subminiature connectors (D-SUB) port.
 13. The display apparatus of claim 10, comprising: a signal converting unit which converts the second video signal into a third video signal; and a signal processing unit which converts at least one of the first video signal and the third video signal into the displayable video signal, wherein the decoder, the signal converting unit, and the signal processing unit are adjacently disposed on the board.
 14. The display apparatus of claim 13, wherein the third video signal is a Transition Minimized Differential Signaling (TMDS) format signal.
 15. The display apparatus of claim 13, wherein the displayable video signal is a low voltage differential signaling (LVDS) format signal.
 16. The display apparatus of claim 13, wherein a distance between the USB port and the decoder is shorter than a distance between the USB port and the signal processing unit.
 17. The display apparatus of claim 13, wherein a distance between the USB port and the signal converting unit is shorter than a distance between the USB port and the signal processing unit.
 18. The display apparatus of claim 13, comprising: a switching unit which outputs one of the first video signal transmitted from the port and the third video signal transmitted from the signal converting unit to the signal processing unit, wherein the switching unit is mounted on the board, and disposed between the USB port and the signal processing unit.
 19. The display apparatus of claim 10, wherein a distance between a center of the display apparatus and the USB port is shorter than a distance between the center of the display apparatus and the port.
 20. A display apparatus having a display module, the display apparatus comprising: a first printed circuit board which is disposed behind the display module, and comprises a plurality of power supply circuit elements; a second printed circuit board which is adjacently disposed to the first printed circuit board; wherein the second printed circuit board comprises: a USB port which receives a USB standard signal from an external apparatus; a first circuit module which transmits and receives the USB standard signal to and from a second external apparatus; a second circuit module which converts a video signal among the USB standard signal into a predetermined format; and a third circuit module which converts the video signal transmitted from the first circuit module or a third external apparatus into a displayable video signal, and transmits the displayable video signal to the display module, wherein the USB port and the second circuit module are adjacently disposed on the second printed circuit board.
 21. The display apparatus of claim 20, wherein the second circuit module comprises: a decoder which decodes a video signal from the USB standard signal output from the USB port; and a signal converting unit which converts the decoded video signal output from the decoder, wherein the decoder, the signal converting unit, and the USB port are sequentially arranged from top to bottom of the second printed circuit board.
 22. The display apparatus of claim 20, wherein the third circuit module comprises: a switching unit which outputs one of the video signal output from a DVI port and the video signal output from the second circuit module; and a signal processing unit which converts the video signal output from the switching unit into the displayable video signal, wherein the switching unit is disposed in an area defined by the DVI port, the USB port and the signal processing unit.
 23. The display apparatus of claim 20, wherein the first circuit module is mounted on a different surface from a surface of the second printed circuit board mounting the third circuit module.
 24. The display apparatus of claim 23, wherein the first circuit module comprises: a USB hub which transmits the USB standard signal output from the USB port to the second circuit module, or transmits the USB standard signal to the second external apparatus through the USB port and other ports.
 25. The display apparatus of claim 24, wherein the second circuit module is mounted on the face of the second printed circuit board, and the USB hub is mounted on the rear side of the second printed circuit board. 